Description

The Foxboro FBM238, also cataloged as the FBM238 Discrete I/O Module, operates as a dedicated hardware component for discrete signal monitoring and external sourcing output execution within Foxboro I/A Series and EcoStruxure DCS platforms.

Hardware Specifications

Channel Isolation and Redundant Fieldbus Execution

The Foxboro FBM238 module incorporates group electrical isolation between the discrete input/output channels and the internal system backplane. Furthermore, the hardware interfaces with dual 2 Mbps module Fieldbus paths (Path A and Path B) to ensure uninterrupted communication during single-path fieldbus switchovers. Integrated input filter and debounce circuitry (configurable at 4, 8, 16, or 32 ms) suppresses field contact noise before transferring discrete states to the control processor.

Frequently Asked Questions

Q: Does the Foxboro FBM238 module support redundant communication paths across the baseplate?

A: Yes, the module accepts simultaneous communications over Path A and Path B of the 2 Mbps Fieldbus, continuing operation automatically if one path fails.

Q: What input filtering options are available on the Foxboro FBM238 channels?

A: The software-configurable filter/debounce settings allow selection between no filtering, 4 ms, 8 ms, 16 ms, or 32 ms response times.

Field Installation Guidelines

• First, slide the module firmly onto the DIN-rail mounted 200 Series baseplate until the retaining latches click into place.
• Next, connect the appropriate Termination Assembly (TA) cable to the baseplate interface connector before applying external field loop power.
• Additionally, fit protective flywheel diodes or MOVs across external inductive loads on the 8 digital output channels to absorb inductive voltage spikes.
• Consequently, maintain proper cable separation between 24 VDC field discrete wiring and heavy AC power lines within panel wireways.